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Investment Securities, Part II (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) securities | Dec. 31, 2017 USD ($) securities | Dec. 31, 2016 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
Proceeds from Sale of Available-for-sale Securities | $ 13,152,000 | $ 159,663,000 | $ 70,757,000
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 172,560,000 |  |
After 1 through 5 years | 302,833,000 |  |
After 5 through 10 years | 215,444,000 |  |
After ten years | 1,437,000 |  |
Fair Value | $ 692,274,000 | 578,579,000 |
Available-for-sale, Weighted Average Yield, Maturities Year One (in hundredths) | 2.57% |  |
Available-for-sale , Weighted Average Yield, Maturities After 1 through 5 Years (in hundredths) | 2.83% |  |
Available-for-sale, Weighted Average Yield, Maturities After 5 through 10 Years (in hundredths) | 2.93% |  |
Available-for-sale , Weighted Average Yield, Maturities After 10 Years (in hundredths) | 3.10% |  |
Available-for-sale , Weighted Average Yield, Maturities (in hundredths) | 2.80% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities Year One (in hundredths) | 2.70% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After 1 through 5 Years (in hundredths) | 3.14% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After 5 through 10 years (in hundredths) | 3.34% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities After Ten Years (in hundredths) | 4.14% |  |
Available-for-sale, Full Tax-equivalent Yield, Maturities (in hundredths) | 3.10% |  |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | $ 39,995,000 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 29,441,000 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 0 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost | 0 |  |
Held-to-maturity, at amortized cost (estimated fair value of $67,909 and $68,457 at December 31, 2018 and 2017, respectively) | $ 69,436,000 | $ 69,332,000 |
Held To Maturity Weighted Average Yield Maturities Year One | 1.76% |  |
Held To Maturity Weighted Average Yield Maturities After 1 Through 5 Years | 2.08% |  |
Held To Maturity Weighted Average Yield Maturities After 5 Through 10 Years | 0.00% |  |
Held To Maturity Weighted Average Yield Maturities After 10 Years | 0.00% |  |
Held To Maturity Weighted Average Yield Maturities | 1.90% |  |
Held To Maturity Tax Equivalent Yield Maturities Year One | 1.76% |  |
Held To Maturity Tax Equivalent Yield Maturities After 1 Through 5 Years | 2.08% |  |
Held To Maturity Tax Equivalent Yield Maturities After 5 Through 10 Years | 0.00% |  |
Held To Maturity Tax Equivalent Yield Maturities After 10 Years | 0.00% |  |
Held To Maturity Tax Equivalent Yield Maturities | 1.90% |  |
Tax rate used to calculate tax-equivalent yields (in hundredths) | 21.00% | 35.00% |
Percentage investment book value exceeds total stockholders' equity (in hundredths) | 10.00% |  |
Available-for-sale Securities, Restricted | $ 628,307,000 | $ 479,398,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 136,312,000 | 289,151,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,748,000) | (3,251,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 319,611,000 | 82,396,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (9,513,000) | (2,613,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 455,923,000 | 371,547,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (11,261,000) | (5,864,000) |
Credit losses on trust preferred securities held [Abstract] |  |  |
Beginning of period | 1,111,000 | 1,111,000 | 1,111,000
Additions related to OTTI losses not previously recognized | 0 | 0 | 0
Reductions due to sales / (recoveries) | (1,111,000) | 0 | 0
Reductions due to change in intent or likelihood of sale | 0 | 0 | 0
Additions related to increases in previously recognized OTTI losses | 0 | 0 | 0
Reductions due to increases in expected cash flows | 0 | 0 | 0
End of period | 0 | 1,111,000 | 1,111,000
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 38,790,000 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 29,119,000 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 0 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 0 |  |
Debt Securities, Held-to-maturity, Fair Value | 67,909,000 | 68,457,000 |
Available-for-sale Securities, Amortized Cost Basis | 701,225,000 | 581,543,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,310,000 | 2,900,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 11,261,000 | 5,864,000 |
Available-for-sale Securities, Gross Realized Gains | 941,000 | 773,000 | 1,192,000
Available-for-sale Securities, Gross Realized Losses | 40,000 | 157,000 | 0
Available-for-sale Securities, Income Tax Expense | 261,000 | 216,000 | $ 465,000
U.S. Treasury securities and obligations of U.S. government corporations & agencies |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 148,656,000 |  |
After 1 through 5 years | 49,993,000 |  |
After 5 through 10 years | 0 |  |
After ten years | 0 |  |
Fair Value | 198,649,000 | 113,770,000 |
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 39,995,000 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 29,441,000 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 0 |  |
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost | 0 |  |
Held-to-maturity, at amortized cost (estimated fair value of $67,909 and $68,457 at December 31, 2018 and 2017, respectively) | 69,436,000 | 69,332,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 16,095,000 | 58,584,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (148,000) | (540,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 105,549,000 | 47,972,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,087,000) | (1,494,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 121,644,000 | 106,556,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (3,235,000) | $ (2,034,000) |
Number of AFS securities in Unrealized Loss Positions | securities | 23 | 11 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 19,683,000 | $ 34,101,000 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (147,000) | (525,000) |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 48,226,000 | 14,540,000 |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,380,000) | (453,000) |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 67,909,000 | 48,641,000 |
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss | $ (1,527,000) | $ (978,000) |
Number of HTM securities in Unrealized Loss Positions | securities | 9 | 7 |
Credit losses on trust preferred securities held [Abstract] |  |  |
Debt Securities, Held-to-maturity, Fair Value | $ 67,909,000 | $ 68,457,000 |
Available-for-sale Securities, Amortized Cost Basis | 201,380,000 | 115,796,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 504,000 | 8,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 3,235,000 | 2,034,000 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 103,000 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 1,527,000 | 978,000 |
Obligations of states and political subdivisions |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 23,282,000 |  |
After 1 through 5 years | 89,930,000 |  |
After 5 through 10 years | 78,294,000 |  |
After ten years | 1,073,000 |  |
Fair Value | 192,579,000 | 166,266,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 38,782,000 | 42,618,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (450,000) | (769,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 42,741,000 | 9,267,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,390,000) | (256,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 81,523,000 | 51,885,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (1,840,000) | (1,025,000) |
Number of AFS securities in Unrealized Loss Positions | securities | 84 |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] |  |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (39) |
Credit losses on trust preferred securities held [Abstract] |  |  |
Available-for-sale Securities, Amortized Cost Basis | $ 193,195,000 | 165,037,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,224,000 | 2,254,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,840,000 | 1,025,000 |
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 622,000 |  |
After 1 through 5 years | 160,900,000 |  |
After 5 through 10 years | 137,150,000 |  |
After ten years | 0 |  |
Fair Value | 298,672,000 | 293,811,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 81,435,000 | 187,949,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,150,000) | (1,942,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 171,321,000 | 22,609,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5,036,000) | (518,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 252,756,000 | 210,558,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (6,186,000) | $ (2,460,000) |
Number of AFS securities in Unrealized Loss Positions | securities | 69 | 26 |
Credit losses on trust preferred securities held [Abstract] |  |  |
Available-for-sale Securities, Amortized Cost Basis | $ 304,372,000 | $ 295,778,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 486,000 | 493,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 6,186,000 | 2,460,000 |
Trust preferred securities |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
Fair Value |  | 2,548,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 2,548,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | (345,000) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 2,548,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (345,000) |
Number of AFS securities in Unrealized Loss Positions | securities |  | 1 |
Credit losses on trust preferred securities held [Abstract] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | $ 2,893,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 345,000 |
Other securities |  |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
One year or less | 0 |  |
After 1 through 5 years | 2,010,000 |  |
After 5 through 10 years | 0 |  |
After ten years | 364,000 |  |
Fair Value | 2,374,000 | 2,184,000 |
Credit losses on trust preferred securities held [Abstract] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 2,278,000 | 2,039,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 96,000 | 145,000 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | $ 0 | $ 0 |

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- Definition The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security. + References No definition available. + Details
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- Definition The yield on an available for sale government security, when the effect of reduced taxes are taken into account, for securities that mature after ten years. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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